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Cylindrical surface element error model under multi-tolerance coupling effect and solving method

An error model and cylindrical surface technology, which is applied in the field of establishment and solution of cylindrical surface element error models under the action of multi-tolerance coupling, can solve problems such as uncertain error ranges, achieve the effect of verifying correctness and avoiding waste of manufacturing costs

Pending Publication Date: 2021-07-02
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the error range of the geometric element error of the cylindrical surface is uncertain under the influence of multi-tolerance coupling constraints in the part design stage, the present invention combines the actual situation and aims at the radial full runout and the cylindricity tolerance. Based on the model of the error variation of the cylindrical surface, and based on the part design accuracy level and the Monte Carlo method to solve the model, a method for establishing and solving the error model of the cylindrical surface elements under the multi-tolerance coupling is proposed

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  • Cylindrical surface element error model under multi-tolerance coupling effect and solving method
  • Cylindrical surface element error model under multi-tolerance coupling effect and solving method
  • Cylindrical surface element error model under multi-tolerance coupling effect and solving method

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[0040] The technical scheme of the present invention is further described below

[0041] see Figure 1-Figure 4 , the specific steps of the establishment and solution method of the error model of the cylindrical surface element under the multi-tolerance coupling effect of the present invention are as follows

[0042] Step 1: Combining the SDT small displacement screw method with the part tolerance, using the small changes of six degrees of freedom to describe the error of the geometric elements of the part. In SDT, V=(μ, ν, ω, α, β, γ), where φ=(μ, ν, ω) represents the small change vector of three degrees of freedom translation along the coordinate system x, y, z, d=(α, β, γ) represents a small change vector rotating along the three degrees of freedom of the coordinate system x, y, z. For different constraints, some parameters in different types of tolerance SDT expressions are zero, that is, when a geometric element rotates or translates along a certain coordinate axis, its...

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Abstract

The invention discloses a cylindrical surface element error model establishing and solving method under a multi-tolerance coupling effect, which comprises the following steps: analyzing a geometric element error constraint of a cylindrical surface, selecting a radial total run-out tolerance and a cylindricity tolerance for coupling analysis, and establishing a coupling error model; determining different tolerance domain ranges by inquiring precision grades of different tolerances, determining probability distribution types of related tolerance parameters, subjecting random parameters to simulation sampling through a Monte Carlo method, and obtaining actual error variation intervals of geometric elements of the cylindrical surface, so that the purpose of obtaining the actual error variation interval by inquiring the tolerance precision grade in the design stage is achieved. The invention focuses on a tolerance modeling method based on mathematical definition, modeling is carried out on the cylindrical surface element error under the multi-tolerance coupling effect in combination with reality, the actual cylindrical surface element error is predicted in the design stage, the feasibility of the design tolerance precision grade is verified, unnecessary manufacturing cost is saved, and a theoretical basis is provided for follow-up basic research.

Description

technical field [0001] The invention relates to the field of tolerance modeling, in particular to a method for establishing and solving error models of cylindrical surface elements under the action of multi-tolerance coupling. Background technique [0002] The machining error of parts is an important factor leading to assembly errors, and it is also unavoidable in the manufacturing process of parts. How to predict the machining error of parts in advance is a key problem that has always existed in the industrial manufacturing industry. Therefore, it is especially important to establish an accurate geometric element error model of parts. important. In the actual manufacturing process, there will often be a phenomenon of multi-tolerance constraints for a certain geometric element. The purpose is to reduce the error range of the part for subsequent use or assembly of the part. Therefore, combined with reality, a multi-tolerance coupling effect is constructed The following geome...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/20G06F17/18G06F17/11
CPCG06F30/17G06F30/20G06F17/18G06F17/11G06F2111/04
Inventor 赵永胜苏李航刘志峰曹子睿赵鹏睿李志雄
Owner BEIJING UNIV OF TECH
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